11. A 1200 lumen (isotropic) light bulb is placed 40 cm in front of a mirrored wall, whose reflectance is R = 0.92. What is the illuminance of the brightest spot on the opposite wall, 3 m away from the mirrored wall? 12. A person is 1.6 m tall with eyes 10 cm below the top of their head. The person stands facing a mirror on a wall. What is the minimum vertical size of the mirror that allows the person to see all of themselves from top of head to toe? Draw a picture ofthe placement and show the relevant ray tracing. 13. In Manet's A Bar at the Follies-Bergere {1882}, shown below, you see a bartender standing front of a large plane mirror. Is the reflection right? Is that you (in the chapeau} talking to her? Find and discuss at least three elements of the reected image that are not as expected. Back up your arguments with ray diagrams. Could Manet be this careless? Some have suggested the uncanny reflection is an intentional construction to provoke a feeling of inebriated unbalance. Or, can the image be reconciled with some kind of odd placement of the viewer? If so, back up your argument with diagram ofthe object and the image